# Experimental Demonstration of Nonlinear Photoconductive Gain in N-Doped $\\beta$-Ga$\_2$O$\_3$ Devices

Source: [Experimental Demonstration of Nonlinear Photoconductive Gain in N-Doped $\\beta$-Ga$\_2$O$\_3$ Devices](<https://www.sota2.com/research/paper/69730066b2be0ed85a78c883>)

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Data updated: 2026-01-24T05:00:05.231Z

Authors: Vikash K. Jangir, Sudip K. Mazumder

Published: 2026-01-22T00:53:20.000Z

## Abstract

Photoconductive devices based on ultra-wide-bandgap (UWBG) materials offer a promising pathway toward compact, high-voltage (HV) optoelectronic and optical sensing in harsh environments. In this Letter, we report field-tunable nonlinear photoconductive gain in vertical $\\beta$-Ga$\_2$O$\_3$ photoconductive devices under sub-bandgap visible-light excitation. The devices were fabricated on a $5.6\\,\\mu\\text{m}$-thick nitrogen-doped semi-insulating $\\beta$-Ga$\_2$O$\_3$ epilayer grown on a conductive Sn-doped substrate and characterized under $445\\,\\text{nm}$ continuous-wave illumination. A distinct transition from linear to nonlinear photoconductive behavior is observed at a threshold electric field of approximately $0.67\\,\\text{MV/cm}$, resulting in an approximately $20\\times$ enhancement in photocurrent. Complementary TCAD simulations indicate strong electric-field localization and a rapid increase in impact-ionization generation at high bias, suggesting that impact-ionization--assisted carrier multiplication contributes to the observed gain. These results demonstrate a high-field visible-light photoconductive detection mode in $\\beta$-Ga$\_2$O$\_3$ enabled by defect-assisted transport, providing a pathway toward field-tunable gain photodetectors operating without deep-ultraviolet (DUV) excitation.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/2601.15555>)

[PDF](<https://arxiv.org/pdf/2601.15555.pdf>)